Issued Patents All Time
Showing 1–25 of 71 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12189680 | Content management device, content management system, and control method | Hiroshi Yahata | 2025-01-07 |
| 11301512 | Content management device, content management system, and control method | Hiroshi Yahata | 2022-04-12 |
| 10862593 | Free-space optical communication receiving device and method of controlling the same | Kohei Hosokawa, Toshiharu Ito, Manabu Arikawa, Takashi Ishikawa, Yoshimasa Ono | 2020-12-08 |
| 10511409 | Received signal processor and method for processing received signal | Kohei Hosokawa, Toshiharu Ito, Manabu Arikawa, Takashi Ishikawa, Yoshimasa Ono | 2019-12-17 |
| 10454577 | Free space optical transmitter and free space optical communication method | Toshiharu Ito, Kohei Hosokawa, Manabu Arikawa, Yoshimasa Ono, Takashi Ishikawa | 2019-10-22 |
| 10411802 | Optical communication device, optical communication system, and optical communication method | Akihiro Tanaka, Toshiharu Ito, Kohei Hosokawa, Manabu Arikawa | 2019-09-10 |
| 10313011 | Free space optical receiver and free space optical receiving method | Toshiharu Ito, Akihiro Tanaka, Kohei Hosokawa, Manabu Arikawa | 2019-06-04 |
| 10256904 | Free space optical receiver and free space optical receiving method | Toshiharu Ito, Kohei Hosokawa | 2019-04-09 |
| 10122447 | Free space optical receiver and free space optical receiving method | Toshiharu Ito, Kohei Hosokawa | 2018-11-06 |
| 9160529 | Secret communication system and method for generating shared secret information | Akio Tajima, Akihiro Tanaka, Wakako Maeda | 2015-10-13 |
| 9097201 | Motorcycle | Hidetoshi Ishigami | 2015-08-04 |
| 8949300 | Circuit and method for controlling quality of random numbers | Akihiro Tanaka, Akio Tajima, Wakako Maeda | 2015-02-03 |
| 8718485 | Quantum key distribution system, optical transmitter, optical modulation control circuit, and optical modulation control method | Akihiro Tanaka, Akio Tajima, Wakako Maeda | 2014-05-06 |
| 8638942 | Method and system for managing shared random numbers in secret communication network | Wakako Maeda, Akio Tajima, Akihiro Tanaka | 2014-01-28 |
| 8391491 | Communication system and synchronization control method | Akihiro Tanaka, Akio Tajima, Wakako Maeda | 2013-03-05 |
| 8327053 | Bus control system and semiconductor integrated circuit | — | 2012-12-04 |
| 8204231 | Method and device for managing cryptographic keys in secret communications network | Wakako Maeda, Akio Tajima, Akihiro Tanaka | 2012-06-19 |
| 8184989 | Communication system and timing control method | Wakako Maeda, Akio Tajima, Akihiro Tanaka | 2012-05-22 |
| 8171354 | Communication system and method for controlling the same | Akihiro Tanaka, Akio Tajima, Wakako Maeda | 2012-05-01 |
| 8096272 | Variable valve device for engine | Hidetoshi Ishigami | 2012-01-17 |
| 8041232 | Optical transmitter and control method thereof | Akihiro Tanaka, Akio Tajima, Wakako Maeda | 2011-10-18 |
| 8041039 | Secret communications system and channel control method | Akio Tajima, Akihiro Tanaka, Wakako Maeda | 2011-10-18 |
| 8009984 | Method and apparatus for measuring optical power of very weak light, and optical communication system using the same | Wakako Maeda, Akio Tajima, Akihiro Tanaka | 2011-08-30 |
| 7974540 | Communication system and communication method using the same | Akihisa Tomita, Kazuo Nakamura, Akio Tajima, Akihiro Tanaka, Yoshihiro Nanbu +3 more | 2011-07-05 |
| 7938100 | Variable valve device for engine | Hidetoshi Ishigami | 2011-05-10 |